Thor Contracting Corporation vs Alpha Roofing
East Bay Roofing Comparison · Updated January 2026
| Thor Contracting Corporation | Alpha Roofing | |
|---|---|---|
| Rating | ★ 4.9 | ★ 5.0 |
| Years Licensed | 4 years | 1 years |
| License # | 1093228 | 1129832 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | El Sobrante, CA | Oakland, CA |
| Website | thorcontractingcorporation.com | alpharoofing.com |
Our Analysis
Key differences include business tenure and some recurring themes in customer feedback. Thor Contracting Corporation has been licensed for 4 years, compared with Alpha Roofing’s 1 year. Thor’s feedback more often references coordination with inspections and permits, and mentions that the company may take projects beyond its immediate area when arranged with customers. Thor is also repeatedly associated with fast turnaround and working within customer budget considerations.
Alpha Roofing’s feedback emphasizes a smooth process with regular updates, punctual crews, and attention to finishing details and cleanup. Some customer experiences specifically mention responsiveness to leak concerns and timely site visits. Overall, the data suggests both focus on communication and scheduling, with Thor more frequently tied to permit/inspection coordination and Alpha more frequently tied to finishing details and leak responsiveness.
Why choose Thor Contracting Corporation?
- ✓ Based in El Sobrante (Contra Costa County) with 4 years of licensing and an active license status.
- ✓ Carries workers’ compensation coverage and maintains a $25,000 bond.
- ✓ Customer feedback commonly mentions roof repairs, roof installation, maintenance, and coordination with inspections and permits.
- ✓ Comments also reference efficient scheduling, fast turnaround, and willingness to work within budget and take projects beyond the immediate area when arranged.
Why choose Alpha Roofing?
- ✓ Based in Oakland (Alameda County) with 1 year of licensing and an active license status.
- ✓ Carries workers’ compensation coverage and maintains a $25,000 bond.
- ✓ Customer feedback frequently highlights clear communication, regular updates, punctual crews, and efficient scheduling.
- ✓ Reviews also mention attention to workmanship and finishing details, cleanup at project end, and responsiveness to leak concerns with timely site visits.
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Frequently Asked Questions
Yes. Both Thor Contracting Corporation and Alpha Roofing are listed as carrying workers’ compensation coverage and maintaining a $25,000 bond.
Thor Contracting Corporation is based in El Sobrante in Contra Costa County, California. Alpha Roofing is based in Oakland in Alameda County, California.
Thor Contracting Corporation has been licensed for 4 years. Alpha Roofing has been licensed for 1 year. Both have active license status.
Thor Contracting Corporation is referenced for roof repairs, roof installation, and maintenance, with some mentions of coordinating inspections and permits. Alpha Roofing is referenced for roofing projects with an emphasis on communication, workmanship details, cleanup, and responsiveness to leak concerns.
Other East Bay Roofing Comparisons
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified January 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.